Write your customizations such that they can be run safely more than once. See the slay script for examples. Formation functions such as print_success and install_brews can be used in your ~/.hot-sauce.

Debugging

Your last Formation run will be saved to ~/formation.log. Read through it to see if you can debug the issue yourself. If not, copy the lines where the script failed into a new GitHub Issue. Or, attach the whole log file as an attachment.